Everything Ever Flashcards
Philosophy
the academic discipline about discovering the fundamental truth of the world.
truth-value
a truth or falsehood where “value” implies a scale between truth and falsehood.
sentence-token
exists in space and time, a concrete object
sentence-type
abstract objects like grammatical structures
Law of Excluded Middle
Every proposition is either true or false
Law of Non-contradiction
No proposition is both true and false
modus ponens
If A then B.
A.
Therefore B.
modus tollens
If A then B.
Not-A.
Therefore not-B.
hypothetical syllogism
If A then B.
If B then C.
Therefore if A then C.
disjunctive syllogism
A or B.
Not-A.
Therefore B.
dilemma
A or B.
If A then C.
If B then D.
Therefore C or D.
reductio ad absurdum
Prove: A Assume opposite: Not-A Argue: B Show B is false. Conclude: A must be true after all.
argument
is made of sentence-types and tokens, propositions; a set of at least two propositions where one follows the other.
validity
property of set of propositions (whether the propositions are true or false)
determination
for any x and any y, given the way x is, y can be in one and only one way.
determinism
idea that for any point in time there is only one possible future; “everything is determined and therefore there is no free will”.